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. 2009 Jun 16;9(6):4751–4765. doi: 10.3390/s90604751

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© 2009 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/).

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Figure 5. — Resonance wavelength shift of a 70-μm-radius Si₃N₄ slot-waveguide ring resonator as a function of hepatitis B surface antigen (HBsAg) concentration [20]. Square dots: experimental data; red line: sigmoidal fit.